The anterior cruciate ligament of the knee is the main stabilizer of the anterior displacement of the tibia with respect to the femur. A twisting movement and medial opening of the knee can injure it. It is a frequent injury in contact sports such as soccer, football, rugby, basketball, and gymnastics. The reconstruction of the ACL is done using a combined technique of open surgery and arthroscopy. The techniques of ACL reconstruction vary according to the graft used; it can be autograft (Harvesting from the patient), allograft (fresh frozen cadaver) bone-tendon-bone or quadruple semitendinosus and gracilis tendons. Before beginning the ACL reconstruction process, your surgeon will examine your knee arthroscopically and repair any additional knee injuries. The reconstruction of the ACL begins with a small incision where tunnels of 10 mm in diameter will be made through which the chosen graft will be passed. Once in the correct position, the graft is fixed to the bone with the selected material (biodegradable interference screws, endobutton, or other fixation devices). As a general rule, physical recovery begins 48 hours after surgery. The incorporation to sports activities takes place approximately 6 to 9 months after surgery.